/*
 * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.micode.notes.gtask.data;

import android.appwidget.AppWidgetManager;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.util.Log;

import net.micode.notes.data.Notes;
import net.micode.notes.data.Notes.DataColumns;
import net.micode.notes.data.Notes.NoteColumns;
import net.micode.notes.gtask.exception.ActionFailureException;
import net.micode.notes.tool.GTaskStringUtils;
import net.micode.notes.tool.ResourceParser;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;


public class SqlNote {
    private static final String TAG = SqlNote.class.getSimpleName();

    private static final int INVALID_ID = -99999;

    public static final String[] PROJECTION_NOTE = new String[]{
            NoteColumns.ID, NoteColumns.ALERTED_DATE, NoteColumns.BG_COLOR_ID,
            NoteColumns.CREATED_DATE, NoteColumns.HAS_ATTACHMENT, NoteColumns.MODIFIED_DATE,
            NoteColumns.NOTES_COUNT, NoteColumns.PARENT_ID, NoteColumns.SNIPPET, NoteColumns.TYPE,
            NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE, NoteColumns.SYNC_ID,
            NoteColumns.LOCAL_MODIFIED, NoteColumns.ORIGIN_PARENT_ID, NoteColumns.GTASK_ID,
            NoteColumns.VERSION
    };

    public static final int ID_COLUMN = 0;

    public static final int ALERTED_DATE_COLUMN = 1;

    public static final int BG_COLOR_ID_COLUMN = 2;

    public static final int CREATED_DATE_COLUMN = 3;

    public static final int HAS_ATTACHMENT_COLUMN = 4;

    public static final int MODIFIED_DATE_COLUMN = 5;

    public static final int NOTES_COUNT_COLUMN = 6;

    public static final int PARENT_ID_COLUMN = 7;

    public static final int SNIPPET_COLUMN = 8;

    public static final int TYPE_COLUMN = 9;

    public static final int WIDGET_ID_COLUMN = 10;

    public static final int WIDGET_TYPE_COLUMN = 11;

    public static final int SYNC_ID_COLUMN = 12;

    public static final int LOCAL_MODIFIED_COLUMN = 13;

    public static final int ORIGIN_PARENT_ID_COLUMN = 14;

    public static final int GTASK_ID_COLUMN = 15;

    public static final int VERSION_COLUMN = 16;

    private Context mContext;
    private ContentResolver mContentResolver;
    private boolean mIsCreate;  // 是否是新建笔记
    private long mId;  // 笔记 ID
    private long mAlertDate;  // 提醒时间
    private int mBgColorId;  // 背景颜色 ID
    private long mCreatedDate;  // 创建时间
    private int mHasAttachment;  // 是否有附件
    private long mModifiedDate;  // 修改时间
    private long mParentId;  // 父级目录 ID（分类文件夹）
    private String mSnippet;  // 笔记内容摘要
    private int mType;  // 笔记类型（普通笔记、文件夹、系统文件夹）
    private int mWidgetId;  // 关联的桌面小部件 ID
    private int mWidgetType;  // 小部件类型
    private long mOriginParent;  // 原始父级 ID
    private long mVersion;  // 版本号
    private ContentValues mDiffNoteValues;  // 存储修改的字段
    private ArrayList<SqlData> mDataList;  // 笔记的详细内容（文本/图片）


    public SqlNote(Context context) {
        mContext = context;
        mContentResolver = context.getContentResolver();
        mIsCreate = true;
        mId = INVALID_ID;
        mAlertDate = 0;
        mBgColorId = ResourceParser.getDefaultBgId(context);
        mCreatedDate = System.currentTimeMillis();
        mHasAttachment = 0;
        mModifiedDate = System.currentTimeMillis();
        mParentId = 0;
        mSnippet = "";
        mType = Notes.TYPE_NOTE;
        mWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;
        mWidgetType = Notes.TYPE_WIDGET_INVALIDE;
        mOriginParent = 0;
        mVersion = 0;
        mDiffNoteValues = new ContentValues();
        mDataList = new ArrayList<SqlData>();
    }

    public SqlNote(Context context, Cursor c) {//创建新的笔记对象，并初始化默认值
        mContext = context;
        mContentResolver = context.getContentResolver();
        mIsCreate = false;
        loadFromCursor(c);
        mDataList = new ArrayList<SqlData>();
        if (mType == Notes.TYPE_NOTE)
            loadDataContent();
        mDiffNoteValues = new ContentValues();
    }

    public SqlNote(Context context, long id) {//通过数据库查询 ID 加载笔记
        mContext = context;
        mContentResolver = context.getContentResolver();
        mIsCreate = false;
        loadFromCursor(id);
        mDataList = new ArrayList<SqlData>();
        if (mType == Notes.TYPE_NOTE)
            loadDataContent();
        mDiffNoteValues = new ContentValues();

    }

    private void loadFromCursor(long id) {//通过 ID 查询数据库中的笔记信息，并调用 loadFromCursor(Cursor c) 解析数据
        Cursor c = null;
        try {
            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, PROJECTION_NOTE, "(_id=?)",
                    new String[]{
                            String.valueOf(id)
                    }, null);
            if (c != null) {
                c.moveToNext();
                loadFromCursor(c);
            } else {
                Log.w(TAG, "loadFromCursor: cursor = null");
            }
        } finally {
            if (c != null)
                c.close();
        }
    }

    private void loadFromCursor(Cursor c) {//解析数据库返回的 Cursor，将数据填充到成员变量
        mId = c.getLong(ID_COLUMN);
        mAlertDate = c.getLong(ALERTED_DATE_COLUMN);
        mBgColorId = c.getInt(BG_COLOR_ID_COLUMN);
        mCreatedDate = c.getLong(CREATED_DATE_COLUMN);
        mHasAttachment = c.getInt(HAS_ATTACHMENT_COLUMN);
        mModifiedDate = c.getLong(MODIFIED_DATE_COLUMN);
        mParentId = c.getLong(PARENT_ID_COLUMN);
        mSnippet = c.getString(SNIPPET_COLUMN);
        mType = c.getInt(TYPE_COLUMN);
        mWidgetId = c.getInt(WIDGET_ID_COLUMN);
        mWidgetType = c.getInt(WIDGET_TYPE_COLUMN);
        mVersion = c.getLong(VERSION_COLUMN);
    }

    private void loadDataContent() {//从数据库中读取当前笔记的详细内容（文字、图片、附件等）
        Cursor c = null;//这些数据存储在 SqlData 对象列表 mDataList 中
        mDataList.clear();
        try {
            c = mContentResolver.query(Notes.CONTENT_DATA_URI, SqlData.PROJECTION_DATA,
                    "(note_id=?)", new String[]{
                            String.valueOf(mId)
                    }, null);
            if (c != null) {
                if (c.getCount() == 0) {
                    Log.w(TAG, "it seems that the note has not data");
                    return;
                }
                while (c.moveToNext()) {
                    SqlData data = new SqlData(mContext, c);
                    mDataList.add(data);
                }
            } else {
                Log.w(TAG, "loadDataContent: cursor = null");
            }
        } finally {
            if (c != null)
                c.close();
        }
    }

    public boolean setContent(JSONObject js) {//如果 mIsCreate == true，说明是新建笔记，调用 insert() 将其插入数据库
        try {
            JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
            if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_SYSTEM) {
                Log.w(TAG, "cannot set system folder");
            } else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_FOLDER) {
                // for folder we can only update the snnipet and type
                String snippet = note.has(NoteColumns.SNIPPET) ? note
                        .getString(NoteColumns.SNIPPET) : "";
                if (mIsCreate || !mSnippet.equals(snippet)) {
                    mDiffNoteValues.put(NoteColumns.SNIPPET, snippet);
                }
                mSnippet = snippet;

                int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE)
                        : Notes.TYPE_NOTE;
                if (mIsCreate || mType != type) {
                    mDiffNoteValues.put(NoteColumns.TYPE, type);
                }
                mType = type;
            } else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_NOTE) {//否则，说明是已有笔记，调用 update() 更新数据
                JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
                long id = note.has(NoteColumns.ID) ? note.getLong(NoteColumns.ID) : INVALID_ID;
                if (mIsCreate || mId != id) {
                    mDiffNoteValues.put(NoteColumns.ID, id);
                }
                mId = id;

                long alertDate = note.has(NoteColumns.ALERTED_DATE) ? note
                        .getLong(NoteColumns.ALERTED_DATE) : 0;
                if (mIsCreate || mAlertDate != alertDate) {
                    mDiffNoteValues.put(NoteColumns.ALERTED_DATE, alertDate);
                }
                mAlertDate = alertDate;

                int bgColorId = note.has(NoteColumns.BG_COLOR_ID) ? note
                        .getInt(NoteColumns.BG_COLOR_ID) : ResourceParser.getDefaultBgId(mContext);
                if (mIsCreate || mBgColorId != bgColorId) {
                    mDiffNoteValues.put(NoteColumns.BG_COLOR_ID, bgColorId);
                }
                mBgColorId = bgColorId;

                long createDate = note.has(NoteColumns.CREATED_DATE) ? note
                        .getLong(NoteColumns.CREATED_DATE) : System.currentTimeMillis();
                if (mIsCreate || mCreatedDate != createDate) {
                    mDiffNoteValues.put(NoteColumns.CREATED_DATE, createDate);
                }
                mCreatedDate = createDate;

                int hasAttachment = note.has(NoteColumns.HAS_ATTACHMENT) ? note
                        .getInt(NoteColumns.HAS_ATTACHMENT) : 0;
                if (mIsCreate || mHasAttachment != hasAttachment) {
                    mDiffNoteValues.put(NoteColumns.HAS_ATTACHMENT, hasAttachment);
                }
                mHasAttachment = hasAttachment;

                long modifiedDate = note.has(NoteColumns.MODIFIED_DATE) ? note
                        .getLong(NoteColumns.MODIFIED_DATE) : System.currentTimeMillis();
                if (mIsCreate || mModifiedDate != modifiedDate) {
                    mDiffNoteValues.put(NoteColumns.MODIFIED_DATE, modifiedDate);
                }
                mModifiedDate = modifiedDate;

                long parentId = note.has(NoteColumns.PARENT_ID) ? note
                        .getLong(NoteColumns.PARENT_ID) : 0;
                if (mIsCreate || mParentId != parentId) {
                    mDiffNoteValues.put(NoteColumns.PARENT_ID, parentId);
                }
                mParentId = parentId;

                String snippet = note.has(NoteColumns.SNIPPET) ? note
                        .getString(NoteColumns.SNIPPET) : "";
                if (mIsCreate || !mSnippet.equals(snippet)) {
                    mDiffNoteValues.put(NoteColumns.SNIPPET, snippet);
                }
                mSnippet = snippet;

                int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE)
                        : Notes.TYPE_NOTE;
                if (mIsCreate || mType != type) {
                    mDiffNoteValues.put(NoteColumns.TYPE, type);
                }
                mType = type;

                int widgetId = note.has(NoteColumns.WIDGET_ID) ? note.getInt(NoteColumns.WIDGET_ID)
                        : AppWidgetManager.INVALID_APPWIDGET_ID;
                if (mIsCreate || mWidgetId != widgetId) {
                    mDiffNoteValues.put(NoteColumns.WIDGET_ID, widgetId);
                }
                mWidgetId = widgetId;

                int widgetType = note.has(NoteColumns.WIDGET_TYPE) ? note
                        .getInt(NoteColumns.WIDGET_TYPE) : Notes.TYPE_WIDGET_INVALIDE;
                if (mIsCreate || mWidgetType != widgetType) {
                    mDiffNoteValues.put(NoteColumns.WIDGET_TYPE, widgetType);
                }
                mWidgetType = widgetType;

                long originParent = note.has(NoteColumns.ORIGIN_PARENT_ID) ? note
                        .getLong(NoteColumns.ORIGIN_PARENT_ID) : 0;
                if (mIsCreate || mOriginParent != originParent) {
                    mDiffNoteValues.put(NoteColumns.ORIGIN_PARENT_ID, originParent);
                }
                mOriginParent = originParent;

                for (int i = 0; i < dataArray.length(); i++) {
                    JSONObject data = dataArray.getJSONObject(i);
                    SqlData sqlData = null;
                    if (data.has(DataColumns.ID)) {
                        long dataId = data.getLong(DataColumns.ID);
                        for (SqlData temp : mDataList) {
                            if (dataId == temp.getId()) {
                                sqlData = temp;
                            }
                        }
                    }

                    if (sqlData == null) {
                        sqlData = new SqlData(mContext);
                        mDataList.add(sqlData);
                    }

                    sqlData.setContent(data);
                }
            }
        } catch (JSONException e) {
            Log.e(TAG, e.toString());
            e.printStackTrace();
            return false;
        }
        return true;
    }

    public JSONObject getContent() {
        try {
            // 创建一个 JSON 对象用于存储便签数据
            JSONObject js = new JSONObject();

            // 如果便签还未创建（即还未插入到数据库），则返回 null 并记录错误日志
            if (mIsCreate) {
                Log.e(TAG, "it seems that we haven't created this in database yet");
                return null;
            }

            // 创建一个 JSON 对象用于存储便签的基本信息
            JSONObject note = new JSONObject();

            // 如果便签类型是普通便签（TYPE_NOTE）
            if (mType == Notes.TYPE_NOTE) {
                // 将便签的各项属性存入 JSON 对象
                note.put(NoteColumns.ID, mId);                // 便签 ID
                note.put(NoteColumns.ALERTED_DATE, mAlertDate);  // 提醒时间
                note.put(NoteColumns.BG_COLOR_ID, mBgColorId);  // 背景颜色 ID
                note.put(NoteColumns.CREATED_DATE, mCreatedDate);  // 创建时间
                note.put(NoteColumns.HAS_ATTACHMENT, mHasAttachment); // 是否有附件（0: 无，1: 有）
                note.put(NoteColumns.MODIFIED_DATE, mModifiedDate);  // 最后修改时间
                note.put(NoteColumns.PARENT_ID, mParentId);  // 父便签 ID
                note.put(NoteColumns.SNIPPET, mSnippet);  // 便签摘要
                note.put(NoteColumns.TYPE, mType);  // 便签类型
                note.put(NoteColumns.WIDGET_ID, mWidgetId);  // 关联的小部件 ID
                note.put(NoteColumns.WIDGET_TYPE, mWidgetType);  // 小部件类型
                note.put(NoteColumns.ORIGIN_PARENT_ID, mOriginParent);  // 原始父 ID

                // 将便签基本信息存入 JSON 对象（以 "meta_head_note" 作为键）
                js.put(GTaskStringUtils.META_HEAD_NOTE, note);

                // 创建 JSON 数组用于存储便签的具体内容数据
                JSONArray dataArray = new JSONArray();

                // 遍历当前便签的所有数据项（mDataList），并将它们转换为 JSON
                for (SqlData sqlData : mDataList) {
                    JSONObject data = sqlData.getContent(); // 获取数据项的 JSON 表示
                    if (data != null) {
                        dataArray.put(data); // 添加到 JSON 数组
                    }
                }

                // 将便签的内容数据存入 JSON 对象（以 "meta_head_data" 作为键）
                js.put(GTaskStringUtils.META_HEAD_DATA, dataArray);
            }
            // 如果便签类型是文件夹（TYPE_FOLDER）或系统便签（TYPE_SYSTEM）
            else if (mType == Notes.TYPE_FOLDER || mType == Notes.TYPE_SYSTEM) {
                note.put(NoteColumns.ID, mId);  // 便签 ID
                note.put(NoteColumns.TYPE, mType);  // 便签类型
                note.put(NoteColumns.SNIPPET, mSnippet);  // 便签摘要

                // 仅存储基本信息（不包含详细数据）
                js.put(GTaskStringUtils.META_HEAD_NOTE, note);
            }

            // 返回构造好的 JSON 对象
            return js;
        } catch (JSONException e) {
            // 捕获 JSON 处理异常，并输出日志
            Log.e(TAG, e.toString());
            e.printStackTrace();
        }

        // 若发生异常，则返回 null
        return null;
    }


    public void setParentId(long id) {
        mParentId = id;
        mDiffNoteValues.put(NoteColumns.PARENT_ID, id);
    }

    public void setGtaskId(String gid) {
        mDiffNoteValues.put(NoteColumns.GTASK_ID, gid);
    }

    public void setSyncId(long syncId) {
        mDiffNoteValues.put(NoteColumns.SYNC_ID, syncId);
    }

    public void resetLocalModified() {
        mDiffNoteValues.put(NoteColumns.LOCAL_MODIFIED, 0);
    }

    public long getId() {
        return mId;
    }

    public long getParentId() {
        return mParentId;
    }

    public String getSnippet() {
        return mSnippet;
    }

    public boolean isNoteType() {
        return mType == Notes.TYPE_NOTE;
    }

    public void commit(boolean validateVersion) {
        // 如果是新创建的便签
        if (mIsCreate) {
            // 如果 ID 还未被分配（即 mId 仍然是 INVALID_ID），但 mDiffNoteValues 包含 ID 信息，则移除它
            if (mId == INVALID_ID && mDiffNoteValues.containsKey(NoteColumns.ID)) {
                mDiffNoteValues.remove(NoteColumns.ID);
            }

            // 将便签插入数据库，并返回插入后的 Uri
            Uri uri = mContentResolver.insert(Notes.CONTENT_NOTE_URI, mDiffNoteValues);

            try {
                // 解析 Uri 获取新创建的便签 ID
                mId = Long.valueOf(uri.getPathSegments().get(1));
            } catch (NumberFormatException e) {
                Log.e(TAG, "Get note id error :" + e.toString());
                throw new ActionFailureException("create note failed");
            }

            // 如果 ID 为 0，则表示创建失败，抛出异常
            if (mId == 0) {
                throw new IllegalStateException("Create thread id failed");
            }

            // 如果便签类型是普通便签（TYPE_NOTE），则遍历 mDataList 并提交其内容
            if (mType == Notes.TYPE_NOTE) {
                for (SqlData sqlData : mDataList) {
                    sqlData.commit(mId, false, -1);  // 提交数据（mId 作为外键）
                }
            }
        }
        // 如果是更新已有便签
        else {
            // 便签 ID 必须有效，否则抛出异常
            if (mId <= 0 && mId != Notes.ID_ROOT_FOLDER && mId != Notes.ID_CALL_RECORD_FOLDER) {
                Log.e(TAG, "No such note");
                throw new IllegalStateException("Try to update note with invalid id");
            }

            // 如果 mDiffNoteValues 中有需要更新的字段
            if (mDiffNoteValues.size() > 0) {
                mVersion++;  // 版本号递增
                int result = 0;

                // 如果不需要验证版本号，则直接更新便签
                if (!validateVersion) {
                    result = mContentResolver.update(
                            Notes.CONTENT_NOTE_URI,
                            mDiffNoteValues,
                            "(" + NoteColumns.ID + "=?)",
                            new String[]{String.valueOf(mId)}
                    );
                }
                // 如果需要验证版本号，则确保版本号符合条件再更新
                else {
                    result = mContentResolver.update(
                            Notes.CONTENT_NOTE_URI,
                            mDiffNoteValues,
                            "(" + NoteColumns.ID + "=?) AND (" + NoteColumns.VERSION + "<=?)",
                            new String[]{String.valueOf(mId), String.valueOf(mVersion)}
                    );
                }

                // 如果没有更新任何数据，可能是因为同步过程中用户修改了便签
                if (result == 0) {
                    Log.w(TAG, "there is no update. maybe user updates note when syncing");
                }
            }

            // 如果便签类型是普通便签（TYPE_NOTE），则遍历 mDataList 并提交其内容
            if (mType == Notes.TYPE_NOTE) {
                for (SqlData sqlData : mDataList) {
                    sqlData.commit(mId, validateVersion, mVersion);
                }
            }
        }

        // **刷新本地缓存数据**
        loadFromCursor(mId);  // 重新从数据库加载便签信息
        if (mType == Notes.TYPE_NOTE) {
            loadDataContent();  // 重新加载便签内容数据
        }

        // **清空变更记录**
        mDiffNoteValues.clear();
        mIsCreate = false;  // 标记便签已创建
    }
}
